package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingcartMapper;
import com.sky.service.ShoppingCartService;
import com.sky.vo.SetmealVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {
    @Autowired
    private ShoppingcartMapper shoppingcartMapper;

    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    @Override
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        //判断当前加入到购物车的商品是否已经存在了
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        //添加userid 通过jwt令牌
        Long currentId = BaseContext.getCurrentId();
        shoppingCart.setUserId(currentId);

        List<ShoppingCart> list = shoppingcartMapper.list(shoppingCart);

        //如果已存在，需要数量加一
        if(list!=null && list.size()>0){
            ShoppingCart cart = list.get(0);
            cart.setNumber(cart.getNumber()+1);  //update shoppingcart set number =? where id=?
            shoppingcartMapper.updateNumberById(cart);
        }else {
            //如果不存在，需要插入一条购物车数据,因为只有dishid或者setmealid 所以还要查询对应的菜品图片 名字等

            //来判断本次添加到购物车的是菜品还是套餐
            Long dishId = shoppingCartDTO.getDishId();
            if(dishId!=null){
                //本次添加过来的是菜品
                Dish dish = dishMapper.getById(Math.toIntExact(dishId));
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());


            }
            else{
                //本次添加到购物车的是套餐
                Long setmealId = shoppingCartDTO.getSetmealId();
                SetmealVO setmeal =setmealMapper.getById(Math.toIntExact(setmealId));
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());

            shoppingcartMapper.insert(shoppingCart);


        }
    }

    /*查看购物车*/
    @Override
    public List<ShoppingCart> showShoppingCart() {
        //获取当前用户id
        Long currentId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart = ShoppingCart.builder()
                .userId(currentId)
                .build();

        List<ShoppingCart> list = shoppingcartMapper.list(shoppingCart);
        return list;

    }

    /*清空购物车*/
    @Override
    public void cleanShoppingCart() {
        //获取到当前微信用户id
        Long userId = BaseContext.getCurrentId();
        shoppingcartMapper.deleteByUserId(userId);
    }
}
